[clang] [HLSL] make semantic matching case insensitive (PR #129773)

[Chris B via cfe-commits]

llvm-beanz wrote:

> > nit: is there a way to check that the spelling is consistent in the error messages? Asking since I am no familiar with this part of the code.
> 
> I'm not sure I understand what you mean.

I think the point (and my earlier comment) is to use the spelling as it is written in the source so that the user can grep their code for the string that occurs in the error message rather than providing consistent capitalization in the error messages.

https://github.com/llvm/llvm-project/pull/129773